托福阅读容易出错的问题已经解释好了。这个问题让新航道的沈阳托福培训小编来解答！

　　目的题是托福阅读中每次考试都必须考的题目。这个问题考察学生是否能充分考虑上下文的总体意思，理解信息之间的逻辑关系，而不仅仅是独立看待一个单词或句子。

　　在解释目的问题时，我们更熟悉例子的作用，然而，有时会考虑其他想法，如转折点、因果关系。

　　然后我们来看一个例子，就是在转折后提问，作者为了强调转折后的内容。

　　易错题分析来了~

　　Question

　　TPO31 Savanna Formation T2

　　Savannas typically experience a rather prolonged dry season.One theory behind savanna formation is that wet forest species are unable to withstand the dry season,and thus savanna,rather than rain forest,is favored on the site.Savannas experience an annual rainfall of between 1,000 and 2,000 millimeters,most of it falling in a five-to eight-month wet season.Though plenty of rain may fall on a savanna during the year,for at least part of the year little does,creating the drought stress ultimately favoring grasses.Such conditions prevail throughout much of northern South America and Cuba,but many Central American savannas as well as coastal areas of Brazil and the island of Trinidad do not fit this pattern.In these areas,rainfall per month exceeds that in the above definition,so other factors must contribute to savanna formation.

　　3.In paragraph 2,the author mentions savannas in Central America,Brazil,and the island of Trinidad in order to:

　　A.argue that these savannas are similar to those in South America and Cuba

　　B.point out exceptions to the pattern of savanna formation in areas with drought stress

　　C.provide additional examples of savannas in areas with five-to-eight-month wet seasons

　　D.indicate areas where savannas are being gradually replaced by rain forests

　　思路解析

　　题目类型：目的题

　　影响选项：A或C

　　影响类型:误以为被问及的句子是例子逻辑

　　在解决这个问题时，我们采取定位-理清句间逻辑(找逻辑词)-验证选项的解题步骤。

　　首先使用savananasanasanasanasa in Central America,Brazil,and the island of 作为一个关键词，Trinidad被定位为倒数第二句，也就是说，每个人都画了一条横线：but many Central American savannas as well as coastal areas of Brazil and the island of Trinidad do not fit this pattern.看到这半个句子和前半个句子之间是but的转折逻辑，转折句子直接解释了Central。 America，沿海地区Brazil的草原与前面介绍的方式不同。让我们回顾一下。后来，我们进一步展示了美国中部和巴西沿海城市草原的差异。In these areas,rainfall per month exceeds that in the above definition,so other factors must contribute to savanna formation翻译说，这些地方的草原每月降水超过了前面的定义(干旱)。相应的B选项(指出干旱压力地区草原形成模式的例外)。

　　很多学生在做目的题时，在方法的应用上不够灵活。他们通常直接找前一句话，所以他们选择了A选项，而学生则向前看了一句话，选择了C选项。无论句子之间的逻辑关系如何，直接往前看几句话都很容易出错。如果题干中提到的内容与前后文有转折逻辑，作者强调反驳前者，导致转折后的信息。

　　然后我们用同样的方法回答下面的一个问题。

　　真题演练

　　TPO 35 Seasonal Succession in Phytoplankon-4

　　【Paragraph 3】Another suggested reason is the change in nutrient level over the year,with differing concentrations favoring different phytoplankton species.While this factor may also contribute,observations suggest that phytoplankton populations rise and fall much more quickly than nutrient concentrations change.

　　4.Why does the author provide the information that“phytoplankton populations rise and fall much more quickly than nutrien

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